13 V zener, DO-35, tight ±1% tolerance
The 1N6003D is a 13 V zener diode from Microchip Technology in the DO-204AH (DO-35) axial-lead package. Its ±1% tolerance on the nominal zener voltage means the regulation point is held to within 130 mV — important when the zener sets a reference rail or clamps a supply line where tighter margins matter. The DO-35 body is a common footprint for through-hole assembly and rework.
Parametric profile for the BOM line
Zener impedance (Zzt) is 25 Ohms at the test current — the dynamic resistance that determines how much the zener voltage shifts with load current. Lower impedance means tighter regulation, and 25 Ohms is typical for a 13 V, 500 mW device in this package class. Reverse leakage is specified at 100 nA maximum at 9.9 V reverse bias — well below the zener knee, so the diode draws negligible current when operating below its regulation voltage. The wide operating temperature range of -65°C to 175°C covers military and industrial thermal profiles without derating concerns. Forward voltage is 1.1 V maximum at 200 mA forward current — the diode can also serve as a general-purpose rectifier in low-current signal paths, though its primary role is zener regulation.